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At least 19 recordsLinked to original sources

PubMed1992

Formation of salivary-mucosal pellicle: the role of transglutaminase.

The present investigation was carried out to identify salivary components of mucosal pellicles in vivo and explore further the mechanism of interaction between salivary molecules and buccal epithelial cells. By using specific antisera and immunoprotein blotting, high-(MG1) and low-(MG2) molecular-mass salivary mucins, amylase, salivary cystatins and proline-rich proteins were detected within mucosal pellicle in vivo. In addition, the data indicated that the mucins and proline-rich proteins could be cleaved into lower-molecular-mass products, whereas the proline-rich proteins could also be cross-linked into higher-molecular-mass complexes. The role of buccal epithelial cell transglutaminase in these interactions was further studied by utilizing purified iodinated amylase, neutral cystatin SN and acidic proline-rich proteins 1 and 3 (APRP1 and 3). After incubation with buccal epithelial cells in vitro 125I-labelled APRPs appeared to undergo a greater degree of cross-linking than 125I-labelled cystatin SN, as determined by SDS/PAGE/autoradiography. Amylase did not appear to be cross-linked at all. Recovery of 125I-labelled APRPs and 125I-labelled cystatin SN with epithelial cell envelopes after repeated extraction suggested that both molecules were cross-linked to envelope proteins, but that 125I-labelled APRPs were cross-linked to a greater degree than 125I-labelled cystatin SN. Cross-linking in buccal epithelial cell preparations was inhibited by an excess of methylamine hydrochloride, a transglutaminase substrate. In a further assessment of amylase, cystatin and APRPs as transglutaminase substrates, only APRP3 and a partially purified preparation of APRPs acted as an amine acceptor for the cross-linking of [14C]methylamine by purified transglutaminase, as determined by SDS/PAGE/fluorography. This reaction was completely inhibited by excess EDTA. The combined data from this study suggest that during mucosal pellicle formation multiple components of saliva adsorb to buccal epithelial cell surfaces, and that, within this group, selected components are enzymically cross-linked by an epithelial transglutaminase and/or proteolytically cleaved into smaller fragments.

Amylases↗

PubMed1992

Use of a replica-plate assay for the rapid assessment of salivary protein-bacteria interactions.

A replica-plate assay was used to screen for the interaction of salivary molecules with dental plaque bacteria. Bacterial colonies cultured from supragingival plaque on sheep-blood (SB) agar were replica-plated onto nitrocellulose membranes overlaying SB or mitis-salivarius agar. Membranes with attached colonies were removed and incubated with 125I-amylase or 125I-proline-rich glycoprotein (PRG). Positive interactions were detected by autoradiography. Only strains of Streptococcus gordonii and Actinomyces viscosus bound amylase, and strains of A. viscosus bound PRG. The results suggest that amylase and PRG bind to selected species of aerobic dental plaque bacteria.

Actinomyces↗

PubMed1992

Reciprocal expression of c-jun, proline-rich protein and amylase genes during rat parotid salivary gland development.

We have investigated the temporal expression and cellular localization of the c-jun proto-oncogene and two major rat parotid gland secretory protein genes, PRP (proline-rich protein) and amylase, during postnatal development. c-jun mRNA steady-state levels increased at days 1, 7 and 14 after birth and decreased to basal levels at 21 days and older. PRP mRNA was first detected at 14 days and abruptly increased to adult levels at day 21. Amylase transcripts were first seen at day 7 and progressively increased to adult levels by 28 days. In situ hybridization demonstrated c-jun mRNA accumulation in the differentiating acinar cells and the ducts. The c-jun mRNA accumulation with time corresponds with the proliferative activity reported to occur in these two cellular populations. PRP transcripts were present exclusively in the well differentiated acinar cells while the accumulation of amylase mRNA corresponded to the progressive commitment of parotid cells to acinar differentiation. Our data suggest that during the postnatal development of the rat parotid gland: (a) c-jun expression associates with parotid gland proliferation and precedes the expression of PRP and amylase genes, and (b) activation of PRP and amylase genes is not concomitant and apparently occurs only in differentiating acinar cells.

Age Factors↗

PubMed1992

cDNA clones for mouse parotid proline-rich proteins. mRNA regulation by isoprenaline and the nucleotide sequence of proline-rich protein cDNA MP5.

cDNA clones for mRNA sequences regulated by isoprenaline in mouse parotid glands were identified by differential colony hybridisation and all hybridised to a diagnostic proline-rich protein (PRP) oligonucleotide. They were divided into two cross-hybridisation groups, A and B, which were shown by hybrid-selected translations to encode acidic PRP and basic PRP, respectively. The A-type subgroup consisted of sequences homologous to the previously identified mouse PRP genes MP2 and MP3. The B-type subgroup comprised clones for the previously identified cDNA pUMP125 (MP4) as well as other PRP sequences. Six of the B-type clones contained a novel PRP cDNA (MP5) and these were sequenced. The composite MP5 cDNA was 897 nucleotides long and contained an open reading frame capable of encoding a 260-residue-long salivary PRP precursor (30% Pro, 19% Gln and 18% Gly), containing nine variant repeat units of consensus PGNQQGPPPQGGPQQ(GPP)R(PPQ). MP5 was 80% identical to the sequence of MP4 and had a high degree of similarity (60%) at its 3'-untranslated region to rat salivary glutamate/glutamine-rich protein (GRP) cDNA. Two MP5 clones contained a 273-bp intron-like insertion in the 3' untranslated region, being derived, therefore, from incompletely spliced MP5 transcripts. Northern blotting showed that, although PRP mRNA species were induced by isoprenaline, a B-type PRP mRNA was present in normal parotid glands. RNA dot-blots probed with PRP-gene-specific oligonucleotides established that MP3, MP4 and MP5 PRP mRNA were all induced by isoprenaline.

Amino Acid Sequence↗

PubMed1992

Isolation and characterization of Actinomyces viscosus mutants defective in binding salivary proline-rich proteins.

Recent studies have provided evidence for human salivary proline-rich proteins (PRPs) serving as potential receptors in the acquired pellicle for Actinomyces viscosus type 1 fimbriae. We report here the isolation of mutants derived from A. viscosus T14V-J1 which are defective in binding to PRPs partially purified from parotid gland saliva. Mutagenesis with ethyl methanesulfonate preceded enrichment for cells nonreactive with PRPs by successive adsorptions with PRP-treated latex beads. Screening was accomplished by random selection of 250 isolated colonies from each of four enrichment cycles and reaction with PRP-treated latex beads in microtiter plates. Two mutants of independent origin were examined for adherence to hydroxyapatite treated with either PRPs, proline-rich glycoproteins, deglycosylated proline-rich glycoproteins, or whole saliva. Additional surface properties that were examined included agglutination with polyclonal antisera to type 1 and type 2 fimbriae, agglutination by a monoclonal antibody to type 1 fimbriae that inhibits adherence of the parent strain to saliva-treated hydroxyapatite, the ability to bind monoclonal antibody to the type 1 fimbrial subunit, and lactose-reversible coaggregation with Streptococcus sanguis 34. Both mutants exhibited reduced binding to hydroxyapatite treated with whole saliva or salivary protein preparations but were still capable of reaction with antiserum to type 1 and type 2 fimbriae. In addition, these mutants possessed the ability to bind monoclonal antibody to the type 1 fimbrial subunit in amounts comparable to the amount bound by the parent strain but were not agglutinated by the adherence-inhibiting monoclonal antibody. When considered with previously published data, these results suggest that an adhesive molecule is probably associated with type 1 fimbriae and allows for the interaction of A. viscosus with constituents in the salivary pellicle.

Actinomyces viscosus↗

PubMed1992

Salivary receptors for GalNAc beta-sensitive adherence of Actinomyces spp.: evidence for heterogeneous GalNAc beta and proline-rich protein receptor properties.

The receptors for GalNAc beta 1-3Gal alpha Oethyl (GalNAc beta)-sensitive adherence of Actinomyces strains to salivary pellicles were investigated. Parotid and submaxillary saliva from one individual was size fractionated and utilized in hydroxyapatite adherence assays with Actinomyces naeslundii 12104 and A. viscosus 19246 and LY7 with and without GalNAc beta. Three parotid salivary fractions, the high-molecular-weight, acidic proline-rich protein (PRP), and statherin fractions, promote GalNAc beta-sensitive adherence of strain 12104, whereas only the high-molecular-weight fraction of submaxillary saliva promotes such adherence. In contrast, strain LY7, possessing a variant GalNAc beta specificity, shows GalNAc beta-sensitive adherence to the leading and trailing regions of the submaxillary PRP fractions but less distinct adherence to the parotid and submaxillary high-molecular-weight fractions. In addition, the PRP and statherin fractions promote adherence of strains LY7 and 19246 that is not inhibited by GalNAc beta. However, whereas strain LY7 binds more strongly to the PRP fraction than to the statherin fraction, strain 19246 binds preferentially to the statherin fractions of parotid and submaxillary saliva. These salivary protein fractions were analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunostained to detect glycosylated proteins. The different salivary receptor properties are paralleled by different glycosylation patterns. The variable GalNAc beta specificities may have evolved to match different salivary glycosylation patterns, and PRP and statherin binding properties seem to be heterogeneous among the Actinomyces strains.

Acetylgalactosamine↗

PubMed1992

Adsorption of human salivary proteins to hydroxyapatite: a comparison between whole saliva and glandular salivary secretions.

The protein compositions of in vitro pellicles formed from whole saliva and parotid and submandibular secretions were determined by use of synthetic hydroxyapatite as a model for dental enamel. The adsorbed and unadsorbed protein fractions were analyzed by amino acid analysis and both anionic and cationic discontinuous polyacrylamide gel electrophoresis. For further characterization of the in vitro pellicle, the adsorbed fractions were subjected to gel filtration on Sephadex G-100 and reversed-phase chromatography on C18 columns. Amylase, acidic and glycosylated proline-rich proteins, statherins, and histatins were identified in the parotid-derived pellicle. Detailed analysis of the statherin-containing fractions resulted in the observation of several statherin-like proteins. The use of cationic gel electrophoresis allowed for the identification of histatin 3 and histatin 5, which have not been previously detected in pellicle formed in vitro. The protein composition of submandibular-derived pellicle was similar to that of parotid-derived pellicle except for the presence of cystatins and the absence of glycosylated proline-rich proteins. In contrast, in vitro pellicle derived from whole saliva exhibited a vastly different composition, consisting primarily of amylase, acidic proline-rich proteins, cystatins, and proteolytically-derived peptides. The results indicate that acidic phosphoproteins as well as neutral and basic histatins from pure secretions selectively adsorb to hydroxyapatite, whereas in whole saliva some of these proteins are proteolytically degraded, dramatically changing its adsorption pattern.

Adsorption↗

PubMed1992

Differential expression of proline-rich proteins in rabbit salivary glands.

Salivary glands synthesize and secrete an unusual family of proline-rich proteins (PRPs) that can be broadly divided into acidic and basic PRPs. We studied the tissue-specific expression of these proteins in rabbits, using antibodies to rabbit acidic and basic PRPs as well as antibodies and cDNA probes to human PRPs. By immunoblotting, in vitro translation, and Northern blotting, basic PRPs could be readily detected in the parotid gland but were absent in other salivary glands. In contrast, synthesis in vitro of acidic PRPs was detected in parotid, sublingual, and submandibular glands. Ultrastructural localization with immunogold showed heavy labeling with antibodies to acidic PRPs of secretory granules of parotid acinar cells and sublingual serous demilune cells. Less intense labeling occurred in the seromucous acinar cells of the submandibular gland. With antibodies to basic PRPs, the labeling of the parotid gland was similar to that observed with antibodies to acidic PRPs, but there was only weak labeling of granules of a few sublingual demilune cells, and no labeling of the submandibular gland. These results demonstrate a variable pattern of distribution of acidic and basic PRPs in rabbit salivary glands. These animals are therefore well suited for study of differential tissue expression of PRPs.

Animals↗

PubMed1992

Identification of cis- and trans-acting factors regulating the expression of rat salivary-specific RP4 gene.

The molecular basis of tissue-specific and cyclic AMP (cAMP)-inducible gene expression in salivary glands is not well understood. Previously, we cloned a salivary-specific proline-rich protein gene, RP4. To analyze the cis-regulatory element(s) that mediates the regulation of this rat salivary RP4 gene, chimeric pRP4CAT constructs containing up to 1.7 kb of the 5'-flanking region of RP4 fused to a reporter gene were transiently transfected into salivary cells. Deletion studies suggest that a 159 bp (-147/+12) fragment of the RP4 5'-flanking region is sufficient to confer salivary-specific induction by agents that can raise intracellular cAMP concentration. Further delineation of this essential sequence revealed that a segment from -136 to -109 is necessary and sufficient to confer cAMP responsiveness in a salivary-specific manner when linked to a heterologous promoter. However, this 28 bp fragment (-136/-109) does not contain an identical match to the consensus cAMP response element (CRE). DNA mobility shift binding assays establish that a sequence-specific DNA-protein complex is formed between this DNA fragment and nuclear proteins from salivary cells, but not with nuclear proteins from HeLa cells, which contain canonical CRE binding proteins (CREBs). Taken together, these data demonstrate that we have identified a 28 bp cis-regulatory element in the RP4 gene that mediates salivary-specific cAMP-inducible gene expression. We propose that the novel salivary-specific CRE binding protein (SCBP) is a key regulator for salivary cAMP-inducible gene expression.

Animals↗

PubMed1992

Heterodimerization between light-regulated and ubiquitously expressed Arabidopsis GBF bZIP proteins.

The promoters of a variety of plant genes are characterized by the presence of a G-box (CCACGTGG) or closely related DNA motifs. These genes often exhibit quite diverse expression characteristics and in many cases the G-box sequence has been demonstrated to be essential for expression. The G-box of the Arabidopsis rbcS-1A gene is bound by a protein, GBF, identified in plant nuclear extracts. Here we report the isolation of three Arabidopsis thaliana cDNA clones encoding GBF proteins referred to as GBF1, GBF2 and GBF3. GBF1 and GBF2 mRNA is present in light and dark grown leaves as well as in roots. In contrast, GBF3 mRNA is found mainly in dark grown leaves and in roots. The deduced amino acid sequences of the three cDNAs indicate that each encodes a basic/leucine zipper protein. In addition, all three proteins are characterized by an N-terminal proline-rich domain. Homodimers of the three proteins specifically recognize the G-box motif, with GBF1 and GBF3 binding symmetrically to this palindromic sequence. In contrast, GBF2 binds to the symmetrical G-box sequence in such a way that the juxtaposition of the protein and the DNA element is clearly asymmetric and hence distinct from that observed for the other two proteins. The fact that GBF1, GBF2 and GBF3 possess both distinct DNA binding properties and expression characteristics prompt us to entertain the notion that these proteins may individually mediate distinct subclasses of expression properties assigned to the G-box. Furthermore, we demonstrate that GBF1, GBF2 and GBF3 heterodimerize and these heterodimers also interact with the G-box, suggesting a potential mechanism for generating additional diversity from these GBF proteins.

Amino Acid Sequence↗

PubMed1992

Transformation by FosB requires a trans-activation domain missing in FosB2 that can be substituted by heterologous activation domains.

Two functionally distinct proteins derived from the FosB gene by alternative splicing have recently been described. FosB protein transforms fibroblasts efficiently, whereas FosB2 protein, a carboxy-terminally truncated form of FosB, does not, despite the fact that both proteins can participate in high-affinity, sequence-specific DNA binding as part of a heterodimeric complex with c-Jun protein. We show here that the functional difference between these proteins is the result of the presence of a potent proline-rich transcriptional activation domain in the carboxy-terminal amino acids unique to FosB. This conclusion is supported by three lines of evidence: (1) Mutations in the carboxy-terminal region of FosB that impair transcriptional activation also reduce transforming potential, despite the fact that DNA binding as part of a complex with c-Jun is not affected; (2) the carboxy-terminal region unique to FosB functions as an activation domain when fused to the DNA-binding domain of GAL4; and (3) transforming potential can be conferred on FosB2 by fusing any of several different well-characterized trans-activation domains. These results identify an additional functional requirement for transformation by Fos proteins and have implications for the mechanism(s) of mitogenic signaling by the AP-1 transcription complex.

Amino Acid Sequence↗

PubMed1992

Solution structure of the SH3 domain of Src and identification of its ligand-binding site.

The Src homology 3 (SH3) region is a protein domain of 55 to 75 amino acids found in many cytoplasmic proteins, including those that participate in signal transduction pathways. The solution structure of the SH3 domain of the tyrosine kinase Src was determined by multidimensional nuclear magnetic resonance methods. The molecule is composed of two short three-stranded anti-parallel beta sheets packed together at approximately right angles. Studies of the SH3 domain bound to proline-rich peptide ligands revealed a hydrophobic binding site on the surface of the protein that is lined with the side chains of conserved aromatic amino acids.

Amino Acid Sequence↗

PubMed1992

Marek disease virus encodes a basic-leucine zipper gene resembling the fos/jun oncogenes that is highly expressed in lymphoblastoid tumors.

Marek disease virus (MDV) is a herpesvirus of chickens that induces T lymphomas within 3 weeks of infection. The short latency and polyclonal nature of MDV-induced tumors have suggested that the virus may encode one or more direct-acting oncogenes. To date, however, no MDV-specific tumor antigens or candidate transforming genes have been demonstrated. In this paper, we report the identification of a MDV gene encoding a protein with homology to the leucine-zipper class of nuclear oncogenes. It also contains a proline-rich domain characteristic of another class of transcription factors. This gene, designated meq, maps to the long repeat of MDV and is one of the few genes that are highly expressed in MDV-induced T-cell tumors. To our knowledge, a herpesvirus gene closely related to the fos/jun family of oncogenes has not been reported previously.

Amino Acid Sequence↗

PubMed1992

A novel family of cell surface receptors with tyrosine kinase-like domain.

Human cDNA clones encoding two novel proteins with a region strongly homologous to the tyrosine kinase domain of growth factor receptors, in particular of the Trk family, were obtained by a polymerase chain reaction-based approach. These proteins, Ror1 and Ror2, share 58% overall amino acid identity and a structure indicative of cell surface molecules. A secretion signal sequence and a transmembrane domain delimit the extracellular portion, which contains immunoglobulin-like, cysteine-rich, and kringle domains. The cytoplasmic portion contains the tyrosine kinase-like domain which (in Ror2) appears to be associated with protein kinase activity in vitro, followed by serine/threonine- and proline-rich motifs. Partial nucleotide sequences of the rat genes reveal striking evolutionary conservation of the proteins between human and rat. The level of expression of the rat genes is high in the head and body of early embryo and decreases dramatically after embryonic day 16. Based on these data, Ror1 and Ror2 appear to define a new developmentally regulated family of cell surface receptors for unidentified ligands.

Amino Acid Sequence↗

PubMed2026

The chromatin reader ZMYND8 recruits the NuRD component GATAD2A through its MYND domain to regulate MAPT213 long noncoding RNA transcription.

The zinc finger MYND-type containing eight protein (ZMYND8) is a chromatin reader that regulates neuronal gene expression by controlling the microtubule-associated protein tau (MAPT) locus. Here, we investigate how ZMYND8 regulates expression of the long non-coding RNA MAPT213 through its interaction with GATA zinc finger domain containing 2A (GATAD2A), a component of the Nucleosome Remodelling and Deacetylase complex. ZMYND8 exhibits opposite regulatory effects on protein-coding MAPT and non-coding MAPT213 transcripts in a manner dependent on its MYND domain, promoting MAPT expression while suppressing MAPT213 levels. Chromatin immunoprecipitation experiments demonstrated that ZMYND8 specifically recruits GATAD2A to the MAPT213 internal regulatory region, establishing a direct link between protein binding and transcriptional control. We determined the crystal structure of the ZMYND8 coiled-coil MYND domain at high resolution, revealing a homodimeric architecture. The MYND domain specifically recognizes GATAD2A through direct interaction with proline-rich motifs in GATAD2A's central region. Structure-function analysis identified critical binding interface residues, while quantitative measurements revealed moderate-affinity interactions enhanced through multivalent binding mechanisms. These findings establish the molecular basis for ZMYND8-mediated recruitment of chromatin remodeling complexes to specific genomic loci and provide a structural framework for understanding transcriptional regulation of MAPT213.

Humans↗

PubMed1992

Control of human coagulation by recombinant serine proteases. Blood clotting is activated by recombinant factor XII deleted of five regulatory domains.

The availability of engineered serine proteases allows one to study the activation, substrate specificity and regulation of human coagulation and fibrinolytic activities. Human coagulation factor XII is composed of the protease catalytic region at the C-terminus, a hinge proline-rich region and regulatory domains at the N-terminus. From cDNA clones coding for factor XII, two DNA molecules were constructed, one being full length and the other being deleted of exons coding for the regulatory domains. Engineered factor-XII cDNA species were inserted by a homologous recombination technique into vaccinia viruses, which were used to infect the human hepatoma cell line HepG2. Two recombinant proteins were prepared from the culture media and identified by their antigenic properties and electrophoretic mobilities. The recombinant protein of larger size was identified as the full-length factor XII of 80 kDa and its specific activities and activation patterns, determined both by the coagulation and the amidolytic assays, are very similar to these of native human factor XII. The recombinant protein of smaller size was identified as a 319-amino-acid-deleted factor-XII protein of 32 kDa, containing only the entire protease region and part of the proline-rich hinge. This protein was expected to be the 'minimal' portion of factor XII able to sustain protease but unable to recognize substrates and surfaces necessary to activate the contact phase of coagulation. However, this 'minimal' factor-XII protein displays a marked protease activity and, although lacking five regulatory domains of factor XII, is bound and activated by negative charges and promotes coagulation with high efficiency.

Base Sequence↗

PubMed1992

Type XIV collagen is a variant of undulin.

We have isolated undulin, an extracellular matrix protein associated with the surface of collagen fibrils, from chicken embryos. The protein showed a molecular mass of about 600 kDa and is composed of three 210-kDa subunits linked by reducible as well as non-reducible bonds. In contrast to human undulin which reportedly is devoid of collagenous sequences, the chicken protein contained a short triple-helical segment that was sensitive to digestion by bacterial collagenase. Screening of an expression library with affinity-purified antibodies yielded two cDNA clones specific for chicken undulin. Analysis of the amino acid sequence deduced from the nucleotide sequence of these clones showed that the human and the chicken protein shared 71% sequence identity. At the amino-terminus both polypeptides contained several similar repeats related to the type III modules found in fibronectin. Towards the carboxyl terminus, however, the two sequences diverged substantially from each other. While the human sequence terminated in a proline-rich segment, the chicken sequence continued with a domain related to von Willebrand factor, with a domain similar to the noncollagenous domain NC4 of type IX collagen and with a typical collagenous triple helix. A short segment of this sequence was found to be identical with the published sequence of a bovine peptide derived from type XIV collagen. Our protein must therefore represent chicken type XIV collagen. One way to explain these results is the possibility that undulin exists in at least two alternatively spliced variants, one lacking the collagenous domain, as described initially for human undulin, and one containing the triple-helical domain, as found in type XIV collagen.

Amino Acid Sequence↗

PubMed2026

Genome-wide characterization of the tomato PERK gene family and its expression profiling under abiotic stresses.

UNLABELLED: This study presents the first systematic genome-wide characterization of the proline-rich extensin-like receptor kinases (PERK) gene family in tomato (Solanum lycopersicum) and their transcriptional responses under abiotic stresses. Using the latest SL4.0/ITAG4.0 genome assembly, we identified six SlPERK genes, all harboring the conserved Ser/Thr protein kinase domain. Evolutionary and structural analyses revealed strong purifying selection (Ka/Ks < 1), distinct exon-intron organizations, and the presence of stress- and hormone-responsive cis-regulatory elements in their promoters. Furthermore, post-transcriptional regulation by 57 miRNAs and complex protein-protein interaction networks were predicted. To validate their stress-responsive roles, two tomato cultivars (GMOTL-1 and Roma) were subjected to cold, heat, and salinity treatments. Quantitative RT-PCR analysis revealed cultivar-specific expression dynamics: SlPERK4 exhibited strong transient induction under cold and heat stress, while SlPERK6 was highly responsive to salinity. Notably, the GMOTL-1 cultivar displayed significantly higher and broader stress-responsive expression profiles compared to Roma, indicating a potential role of these SlPERK genes in cultivar-specific stress tolerance. These findings provide a comprehensive genomic resource and establish a critical foundation for the functional validation and molecular breeding for stress-resilience tomato cultivars. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at https://doi.org/10.1007/s13205-026-05044-y.

Abiotic stress↗